**Please show how to do by hand.   4) Social Media Usage. The Pew Research Center has conducted extensive research on social media usage. One finding, reported in June 2018, was that 78% of adults aged 18 to 25 use Snapchat. Another finding was that 45% of those aged 18 to 25 use Twitter. Assume the sample size of both findings is 500. Develop a 95% confidence interval for the proportion of adults aged 18 to 24 who use Snapchat. Develop a 99% confidence interval for the proportion of adults aged 18 to 24 who use Twitter. In which case, part (a) or part (b), is the margin of error larger? Explain why.

Q: In a survey of 2224 adults in a recent​ year, 1280 say they have made a New​ Year's resolution.…

A: Obtain the 90% confidence interval for the population proportion. The 90% confidence interval for…

Q: In a survey, 8 people were asked how much they spent on their child's last birthday gift. The…

A: The sample size, i.e., the sampled number of people, n=8.The sample mean, x¯=$37.The sample standard…

Q: A local news outlet reported that 56% of 600 randomly sampled Kansas residents planned to set off…

A: We have given that,  Sample proportion (p̂) = 56% = 0.56 and sample size (n) = 600 Then,  We will…

Q: Find the margin of error at a 90% confidence level.

A:

Q: In a survey of 2549 adults in a recent​ year, 1270 say they have made a New​ Year's resolution.…

A:

Q: In a survey of 2195 adults in a recent​ year, 1454 say they have made a New​ Year's resolution.…

A:

Q: A university dean is interested in determining the proportion of students who receive some sort of…

A: Given data, n=152 x=101 p=x/n =0.664 The 95% CI is Zc=1.96

Q: 5. Attending sporting events is a popular source of entertainment. When 1000 people were surveyed,…

A: Given that 1000 people were surveyed. Therefore the sample size is  n=1000 After survey it is found…

Q: A professor is interested in how attendance influences grades her class. She goes through her…

A: 1) Given Data :  We will calculate the point estimate which will be the mean of this sample data,…

Q: Construct and interpret a 95% confidence interval. Please show software/calculator work. Follow up…

A: The 95% confidence interval for the proportion of Americans that exercise in the morning is…

Q: For a sample of 120 businesses, the average profit they generate in a month is $54,000 with a…

A: We have given that,  Average or sample mean (x̄) = 54000, standard deviation (s) = 8800 and sample…

Q: Toastmasters International cites a report by Gallup Poll that 40% of Americans fear public speaking.…

A:

Q: Your research study is investigating whether the use of a new medication will have an effect on…

A: I am afraid that t-test is not the correct approach here. Here, a Chi-square test would probably…

Q: Anystate Auto Insurance Company took a random sample of 378 insurance claims paid out during a…

A: given data  n = 378 x¯ = 1550σ = 264 find 90% ci for μ.

Q: Explain which would result in a wider large-sample confidence interval for : a 90%pconfidence level…

A: The z critical value for 95% confidence interval is 1.96 and the z-critical value for 90% confidence…

Q: malls were the exclusive focus of 10 percent of articles. The standard error of that proportion is 3…

A: From the provided information,Confidence level = 95%

Q: It is known that ticks in York County carry the Lyme disease.  In a representative sample of 200…

A: Let n=sample size, X=number of Carry disease. p^=x/n  X=167, n=200

Q: In a study of 120 randomly selected families, 50 said they streamed their television content. Find…

A:

Q: In a survey of 2405 adults in a recent​ year, 1217 say they have made a New Year's resolution.…

A: Given: n=2405 x=1217

Q: In a survey of 2407 adults in a recent​ year,1468 say they have made a New​ Year's resolution.…

A: Given that,  Sample size, n= 2407 And X= 1468 We know that proportion, p=X/n So p= 1468/2407 p=…

Q: In a survey of 2108 adults in a recent​ year, 1305 say they have made a New​ Year's resolution.…

A:

Q: In a survey of 2000 adults in a recent​ year 1404, say they have made a New​ Year's resolution.…

A: n=2000x=1404

Q: The data below represents the overall miles per gallon (MPG) of 2008 SUVS priced under $30,000.…

A: (a) The sample mean and standard deviation are, The degree of freedom is, Critical value: Using…

Q: In a survey of 2969 ​adults, 1401 say they have started paying bills online in the last year.…

A:

Q: 5-Seventy percent of 50 randomly selected students from college of science and engineering were…

A:

Q: According to Thomson Financial, through January 25, 2018, the majority of companies reported profits…

A: The sample proportion of companies showed beat estimates is, p^=104162=0.6420 The sample proportion…

Q: Ten different families are tested for the number of gallons of water a day they use before and after…

A: From the provided information, The difference between before and after are as follow: Before…

Q: igh school soccer league there are a total of 256 players.

A: Given that Total players in high school soccer league (n) = 256 players The mean height of the…

Q: A poll asked whether states should be allowed to conduct random drug tests on elected officials. Of…

A:

Q: The mean cost of a meal for two in a mid-range restaurant in Tokyo is $40 (Numbeo.com website,…

A: Given the mean cost of a mean for two in mid- range restaurant in tokyo is $40.The data for cost of…

Q: A poll asked whether states should be allowed to conduct random drug tests on elected officials. Of…

A: n = 21410 p^ = 0.72 99% ci for p

Q: In general, when you increase the confidence level for a confidence interval using the same sample…

A: As confidence level increases critical value is going to increase .  Here they given sample…

Q: A new survey found that out of a random sample of 300 high school students throughout the country…

A: From the provided information, Sample size (n) = 300 83% of them still planned on taking the…

Q: If 64% of a sample of 550 people leaving a shopping mall claims to have spent over $25 create and…

A: Given,   Sample size = 550 Sample proportion = 0.64   Critical value: Using z-table, the z-critical…

Q: QUESTION #2. In a Harris poll, adults were asked if they are in favor of abolishing the penny. Among…

A:

Q: In a survey of 2497 adults in a recent​ year, 1383 say they have made a New​ Year's resolution.…

A: The sample size (n) is 2497 and the value of x is 1383.

Q: In 2017, the CDC administered the Youth Risk Behavior Survey (YRBS) to a random sample of 14,795…

A: Obtain the 99% confidence interval for the proportion of the high school students have been cyber…

Q: In a survey of 2554 adults in a recent​ year, 1357 say they have made a New​ Year's resolution.…

A:

Q: Example:  You would like to construct a 90% confidence interval for the proportion of graduating…

A: Obtain the value of the point estimate. The value of the point estimate is obtained below: Thus,…

Q: 3. The Pew Internet and American Life Project conducted a poll between Oct 23 and Nov 19, 2006, in…

A: Given information X = 598, Sample size (n) = 935

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.